<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <ul>
        <li v-for="item in list">
          <span>{{ item.num }}</span>
          <button @click="del(item.id)">删除</button>
        </li>
      </ul>
      <button @click="add">添加</button>
    </div>
    <script src="../work1/js/vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          list: [
            { num: 1, id: 1 },
            { num: 5, id: 2 },
            { num: 3, id: 3 },
          ],
        },
        methods: {
          add() {
            this.list.push({
              num: Math.floor(Math.random() * 9) + 1,
              id: this.list.length + 1,
            });
          },
          del(id) {
            this.list = this.list.filter((item) => item.id != id);
          },
        },
      });
    </script>
  </body>
</html>
